Clutch and brake mechanism.



F. G. DUSTIN, 0. M.FRYKMAN & A. WATTS.

CLUTCH AND BRAKE MVEGHANISM. APPLIUATION FILED MAY 19, 1911.

1, 1 1 9,938. I Patented Dec. 8, 1914.

Way, 3

UNITED sTATEs PATENT oFEioE.

FRED G. DUsTIN, osoAB. M. FREEMAN, AND ART-np3 WATTS, or MINNEAPOLIS, MINNESOTA.

CLUTCH ANI) BRAKE MECHANISM.

Application led May 19, 1911.

To all 'whom 'it mag concern Be it known t at we, FRED G. DUsTIN,

OSCAR M. FRYKMAN, and ARTHUR WA'i'rs,

citizens of the United States residing at Minneapolis, in the county of I-lennepin and State of Minnesota., have invented certain new and useful Improvements in Clutch and Brake Mechanism; and we do hereby declare the following to be a full, clear, and exact description of the invention, suoli as will enable others skilled in the art to which it appertains to make and use the same.

Thls invention has for its object to provide an improved clutch and brake mechanism, and to this end, it consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

In the numerous mechanical organizations, it is highly desirable, in various instances, that a driven shaft or member be uncoupled from a driving shaft or member and suddenly brought to a stop. In certain instances, clutches have been provided for disconnecting a driven shaft from a driving shaft or source of power, and in other instances, brakes have been applied for stopping or retarding the motion of a driven member without disconnecting the same from a drivin shaft or source of power.

This invention provides a novel coperative organization of a brake and clutch, whereby, approximately simultaneously, a brake is applied to stop or arrest the movement of the driven member or shaft and the driving shaft or source of ower is uncoupled from the driven mem er so that it will not exert a driving power thereon when the brake is set. A device of this kind is capable of a very great many different uses, impossible to enumerate in full, but among which, the following important uses may be mentioned, to-wit, an emer ency brake and clutch for automobiles, w ere, when the emergency brake is set, the engine will be thrown out of its driving action while it still runs` an einer ency or safety coupling for line shafts in actories or elsewhere, by the use of which, in the case of an accident, for instance, a certain shaft, or section thereof, may be quickly stop ed; for starting and stopping various in Specification of Letters Patent.

ividual power Patented Dec. 8, 1914.

Serial No. 628,143.

driven machines such as sewing machines, for example; and an emergency brake for elevators.

` paits throughout the` several views.

Referring to the drawings, Figure 1 is a side elevation of the improved clutch and brake mechanism; Fig. 2 is a section taken on the line .v2 al of Fig. l; and Fig. 3 is an elevation showing the clutch and brake mechanism with the so-called brake wheel removed.

The numeral l indicates a driving member which may be assumed tobe an engine shaft or a shaft positively driven from an engine or motor.

The numeral 2 indicates a driven member in the form of a shaft which is axially aliiied with the shaft 1.

The driving element of the clutch and brake mechanism proper is shown as in the f0rm` of a disk-like wheel 3, having its hub secured to the driving shaft l bv a cani, kev, or other means.

he numeral 4 indicates the driven elcment of a clutch which is shown in the form of a diametrically extended plate-like arm having a long hub that is keyed, or otherwise rigidly secured to the driven shaft or member 2. The wheel 3 is provided with a laterally projecting peripheral flange which, as shown, is formed with a multiplicity of radial plunger seats 5 that are adapted to be engaged by the outer ends of clutch plungers G mounted for radial movements in the bearing lugs 7 and 8 on the arms 4. To hold the clutch plungers 6 against rotation on their own axes, they are shown as provided with short projecting studs 9 that work in radial slots 10 of the arm 4. One or more of these clutch plungers 6 may be employed,

tively, connected for common rotation.

diametrically opposite segmental slots or cam channels 13 in which the studs 11 of the clutch plungers 6 are arranged to wor-lr. The enter surfaces of these slots 13 are formed et inwardly diverging cam surfaces 13al with which the plunger studs 11 are held engaged by coiled springs 1t that re-act against the bearing lugs 8 and against the said plungers with a :torce tending to move the same outward. Normally, or when no friction is appliedy to interfere with the rotation of the brake 12, the said wheel will be held in an intermediate position in re-y spect to the driven clutch element arm, and the said clutch wheel 'will simply be given a rotation that is common to that o' said arm and of the driven shaft 2. I

fthe brake wheel 12 is, as shown, formed with a cylindrical peripheral dange 12 with minette and setting ot the brakes is accomplished instantlyY and without making it necessary to stop the movement of the driving member .or source of power. The force with which the brake will be set, will, ot coarse, depend upon the pressure under which it is forced against the brake Wheel 12. The said' brake wheel 12 has, as is evident only a -limited rotary motion in respect to the drivenclutch element d and driven'shat or member 2, and hence, when the studs 11 -reach the limits of the slots 13, the said driven. clutch element and driven shaft cannot run ahead of the brake wheel and their motion must bearrested or sto ped with that of the said brake wheel. .ds soon' as the brake shoe 15 is disengaged from .the

brake wheel 12,'the springs 1t, 4pressing the v Clutch piangere Ilf' do' lot instantly "aline with A the plungerseats ftheyf'willat least dose before the' drivingclntclreleme'nt 1l has made which a bra-ke shoe, brake band, or other more `than allait rotationjthey do come into alinementfw'ith these' seats 5, all

brake element is adapted to coperate and which, shown, is in the form ot a oratie shoe 15 mounted to move through suitable fixed. guides 16 into and out of engagement with the said bralreiwheel 12. l ,v

The operation of this improved device is substantially as follows: Normally, the brake sho-e 15 will be out of engagement with the brake wheel 12 and the driving and driven elements 3 and d of the clutch are locked together by the clutch plungers or bolts G, so that the driving and driven members orthe shafts 1 and 2 will be given common rotation. W' lien it -is desired to stop the rotation of the shaft or member 2, it is only necessary to force the brake shoe 15 into engagement with the peripheral tace of the bralrewheel 12 solas to arrest the movement thereof, suiiciently to cause the studs 11 of the clutch plungers 6 to run to the extremity of one of the cam surfaces 138. rThis will disengage the clutch plungers 6 from the driving wheel or clutch element 3, and hence, entirely free or release the driven shaft 2 from the drivingv shaft 1. |Thus it will be seenthat simultaneously, or approximately so, a brake is set to stop the rotation ofthe driven shaft or member, andthe latter is uncoupled from the driving member or source of power. rlihis prevents the ysource or power, such as an engine or motor, from operating against the set4 brake. The uncoupling ot .the driving anddriven members ofthe parts ot the combined clnteh orbra'lte meohamsm .willjthen' be restored "to their Anormal relative position shown in the drawings, and in which the bralre in released and the driving and driven-.members are con.

pled @getallen4 t "fl/'What we claim is:

1. The combination with" and driven members having coperating clutch ico "los

elementmeertain of the; clutch elements of said driven member being yieldingly pressed into action, et a bralre element having only a limited rotation in respect to said driven member and provided with a cam surface permitting the engagement between l the yieldingly y pressed clutch element of isaiol driven member and the cooperating clutch element of said driving member, when said brake element is loose and tree for rota# tion, but operative to retract theyieldingly pressed clutch element of said 'driven member, whenever rotation of said. 'lorakeelement is retarded.

2. The combination with driving and driven members having coperating clutch elements, .certain of the clutch elements of said driven member 1being yieldingly pressed radiall outward, of a wheel, having only a limite 1 rotation in lres ect to the driven member and provided with reversely acting, cam surfaces permitting' en agement, be tween the yieldingly pressed c utch elemen of said driven member and the coperating clutch element of said driving member when said Wheel is loose and free for rotation with said driving member, but operative to retract the yieldngly pressed clutch element of said driven member, whenever rotation of Suid wheel is retarded with respect to said driving member.

In testimony whereof we aix our signatures in presence of two witnesses.

FRED G. DUSTIN. OSCAR M. FRYKMAN. ARTHUR WATTS. Witnesses:

Blmmo G. WHEELER, HARRY D. KILGORE. 

